Open source API development ecosystem - https://hoppscotch.io (open-source alternative to Postman, Insomnia)

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

Mobile Security Framework (MobSF) is an automated, all-in-one mobile application (Android/iOS/Windows) pen-testing, malware analysis and security assessment framework capable of performing static and dynamic analysis.

Hurl, run and test HTTP requests with plain text.

MeterSphere 是新一代的开源持续测试工具，让软件测试工作更简单、更高效，不再成为持续交付的瓶颈。

An interactive command-line HTTP and API testing client built on top of HTTPie featuring autocomplete, syntax highlighting, and more. https://twitter.com/httpie

Test Automation Made Simple

Newman is a command-line collection runner for Postman

Friendly and fast tool for sending HTTP requests

A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.

HTTP parameter discovery suite.

Unit and Integration Test generation for Developers. Generate tests and stubs for your application that actually work!

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

HttpRunner 是一个开源的 API/UI 测试工具，简单易用，功能强大，具有丰富的插件化机制和高度的可扩展能力。

🚀 HTTPie Desktop — cross-platform API testing client for humans. Painlessly test REST, GraphQL, and HTTP APIs.

Local-first Developer Tool to Build, Test, Intercept & Mock API Requests. Requestly is a combination of REST API Client and HTTP Interceptor. It is simple, beautiful and powerful alternative to Postman, Insomnia, Bruno and Charles Proxy.

Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop

Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is built and used by Kong, the author of the open-source Kong Gateway.

☔ 敏捷开发最强大易用的接口工具，机器学习零代码测试、生成代码与静态检查、生成文档与光标悬浮注释，腾讯、华为、SHEIN、传音、工行等使用 ☔ The most advanced tool for HTTP API. Testing with machine learning, generating codes and static analysis, generating comments and floating hints. Used by Tencent, Huawei, SHEIN, TRANSSION, ICBC, etc.

API Dash is a beautiful open-source cross-platform (macOS, Windows, Linux, Android & iOS) API Client built using Flutter which can help you easily create & customize your HTTP & GraphQL API requests, visually inspect responses and generate API integration code. A lightweight alternative to postman/insomnia.